lockd(1M) lockd(1M)
NAME
lockd: rpc.lockd - network lock daemon
SYNOPSIS
graceperiod] listen_min_backlog] timeout] [nthreads]
DESCRIPTION
The lockd utility is part of the NFS lock manager, which supports record lock and share lock operations on NFS files. See fcntl(2) and
lockf(2). provides two functions:
o It forwards locking requests for NFS mounted file systems to the lockd on the NFS server.
o It generates local file locking operations in response to requests forwarded from running on NFS client machines.
State information kept by the lockd about these locking requests can be lost if is killed or the operating system is rebooted. Some
of this information can be recovered as follows. When a server recovers, it waits for a grace period for all NFS client-site to
submit reclaim requests. Client-site is notified by the of the server recovery, and promptly resubmits previously granted lock
requests. If a fails to secure a previously granted lock at the server site, then the sends a to the process holding that lock.
Administrators can make changes to the startup parameters for by logging in as root and editing the file (see nfs(4)). Administra-
tors can also make changes by using the command.
Options
recognizes the following options and command-line arguments:
Deprecated in favor of the
parameter in the NFS default file, which is equivalent. Specify the number of seconds that all clients (both NLM
and NFSv4) have to reclaim locks after the server reboots. This option also controls the NFSv4 lease interval.
The default value is 90 seconds.
Specify the listener backlog,
listen_min_backlog, which is the number of connect requests that are queued and waiting to be processed before new
connect requests begin to get dropped.
Specify the number of seconds to wait before retransmitting a lock
request to the remote server. The default value is 5 seconds. Equivalent to the parameter in the NFS default
file.
nthreads Specify the maximum number of concurrent threads that the server can handle. This concurrency is achieved by up
to nthreads threads created as needed in the kernel. nthreads should be based on the load expected on this
server. If nthreads is not specified, the maximum number of concurrent threads will default to 20. Equivalent to
the parameter in the NFS default file.
Notes
A directory service that provides service name data base support must have the following service entries in its database:
Kernel Lock Manager logging can be enabled using By default, the variable is 0 which disables the Kernel Lock Manager logging feature. The
maximum value is 9. The value determines how detailed the log messages are.
AUTHOR
was developed by Sun Microsystems, Inc. and HP.
SEE ALSO
clear_locks(1M), kctune(1M), setoncenv(1M), statd(1M), fcntl(2), lockf(2), signal(2), getservent(3N), nfs(4), nsswitch.conf(4), ser-
vices(4).
lockd(1M)
